[andrewflnr]

A panspermia theory that involved non-living chemicals coming to Earth would be pretty useless. There's no real doubt that it's possible to generate those chemicals on Earth, and AFAIK it's still believed to be easier to make them on Earth than in space. Organic chemicals from space would just mix with all the ones that were already here.

[lovemenot]

>> it's still believed to be easier to make them on Earth than in space

I don't mean to be glib, but space is very large and time before our planet was formed is very long.

I assume that if it was easy here in those first few hundred million years, it had already been even easier in many elsewhere places. Any one, or multiples of which could have seeded us with as yet locally unavailable precursors and possibly even life.